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A simple offline web3 transaction input decoder for functions and constructors
A simple offline web3 transaction input decoder for functions and constructors.
pip install web3-input-decoder
Let's take a USDT transfer transaction and the USDT contract creator transaction as an example:
>>> import json
>>> import urllib.request
>>> from web3_input_decoder import decode_constructor, decode_function
>>> f = urllib.request.urlopen("https://api.etherscan.io/api?module=contract&action=getabi&address=0xdac17f958d2ee523a2206206994597c13d831ec7")
>>> TETHER_ABI = json.loads(json.load(f)["result"])
>>> decode_function(
TETHER_ABI, "0xa9059cbb000000000000000000000000f050227be1a7ce587aa83d5013f900dbc3be0611000000000000000000000000000000000000000000000000000000000ecdd350",
)
[('address', '_to', '0xf050227be1a7ce587aa83d5013f900dbc3be0611'),
('uint256', '_value', 248370000)]
>>> decode_constructor(
TETHER_ABI, "000000000000000000000000000000000000000000000000000000174876e800000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c00000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a546574686572205553440000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000045553445400000000000000000000000000000000000000000000000000000000"
)
[('uint256', '_initialSupply', 100000000000),
('string', '_name', 'Tether USD'),
('string', '_symbol', 'USDT'),
('uint256', '_decimals', 6)]
You can also play with it here.
If you have lots of inputs in the same contract to decode, consider using InputDecoder
.
>>> from web3_input_decoder import InputDecoder
>>> decoder = InputDecoder(TETHER_ABI)
>>> for _ in range(10000):
>>> decoder.decode_function(
(
"0xa9059cbb000000000000000000000000f050227be1a7ce587aa83d5013f900dbc3b"
"e0611000000000000000000000000000000000000000000000000000000000ecdd350"
),
)
def decode_constructor(
abi: List[dict],
tx_input: Union[str, bytes],
bytecode: Optional[Union[str, bytes]] = None,
) -> List[Tuple[str, str, Any]]
Parameters:
abi
: Contract ABItx_input
: Transaction input to decode, with or without deployed contract bytecodebytecode
: Optional deployed contract bytecode. If this is set, tx_input
should include bytecodeReturns:
List[Tuple[str, str, Any]]
: Decoded type-name-value tuplesdef decode_function(
abi: List[dict], tx_input: Union[str, bytes]
) -> List[Tuple[str, str, Any]]
Parameters:
abi
: Contract ABItx_input
: Transaction input to decodeReturns:
List[Tuple[str, str, Any]]
: Decoded type-name-value tuplesExisting solutions are not satisfying to me, e.g.:
FAQs
A simple offline web3 transaction input decoder for functions and constructors
We found that web3-input-decoder demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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